Jack was named CEO of a new bitcoin company, Twenty One Capital.
Here’s a link that will explain it better than I can. 😊 

Bitcoin Magazine
Jack Mallers Named CEO Of New Bitcoin Powerhouse Twenty One Capital, Plans To Launch With 42,000 BTC
Backed by Tether and SoftBank, Twenty One Capital, led by Strike CEO Jack Mallers, will go public via a SPAC deal and launch with one of the larges...